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CVE-2026-49415

Local privilege escalation via execve(2) TOCTOU race

High8.8EPSS 0.36%
Published
Updated
Reserved
Assigned by
freebsd

Description

During execve(2) of a SUID binary, the new virtual address space is installed before the process credentials are updated. During this window, a process running as the same user can access the target process's memory via procfs or linprocfs, because the kernel's debugging permission check still saw the original credentials. An unprivileged local user can exploit this race to modify the address space of a SUID binary before its credentials are elevated, potentially gaining full control of the affected system.

Scores

CVSS scores of CVE-2026-49415, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1High8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Analyzed3.1High8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.36% · top 70% of all CVEs (5 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.

Weakness

Affected products

  • FreeBSD · FreeBSD

    • affected 15.1-RELEASE – < p1
    • affected 15.0-RELEASE – < p11
    • affected 14.4-RELEASE – < p7
    • affected 14.3-RELEASE – < p16

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .